I have built the Audax home theater center channel speaker and I am in the process of building the boxes for the left and right speakers now. I have veneered the back and sides for the center channel. Trimming the veneer with a laminate trimming bit was no problem for the outside edges and the ports. I am wondering how to trim out the holes for the speaker drivers. The ball bearing on my laminate trimming bit is thicker than the recess for my speakers. Has anyone else run into this problem and how did you overcome it?